To me...meeting local folks along the way, or especially other overlanders, and experiencing thier culture or their adventures is a big part of overlanding.
Talked with two couples from Germany (both of which had logged 15K since shipping their vehicle state side), a dude from Australia (who had traveled Africa, Europe, South America and was traveling through North America at the time), couple from VA that were on their way to Prudhoe Bay (share insight about the Dalton Hwy with them), and met countless others. And every conversation was a moment gained.
To me...overlanding is about breaking out of the normal, doing what few do, being uncomfortable, challenging yourself, rewarded when things go right and punished when they don't. But, learning from each experience.
Sure, solitude is a big part of it too. And embracing nature and all the outdoors offers. But, it's a complete package. Stopping at the little remote Alaskan gas station(s), visiting with the lone owner behind the counter, who has owned and operated it for the past few decades, not some clerk that knows nothing about nothing at a huge truck stop.
Their story is far more interesting...than most you'll encounter.
Travel as much as possible.